(OT) but still techie - metal tubing ?

[g8dhe]

I'm looking for a short, 5cm length, of metal tubing almost any metal will do (Alu, Brass, steel), but needs to be 18mm OD and 16mm ID that's a 1mm wall thickness, anybody have anything or know of a source ?

[Scott]

Haven't got any but found this if its any use

http://cgi.ebay.co.uk/18MM-OD-X-16MM-ID ... 335649f863

[scanner]

I'll have a look............

How exact must that measurement be? Could you get thicker walled tube reamed out?

[g8dhe]

http://cgi.ebay.co.uk/18MM-OD-X-16MM-ID ... 335649f863

Yes I found that a few minutes after putting the post up as well! No idea why it didn't come up on earlier searches, I may go for that if I can't find anything cheaper, but many thanks for hunting as well!

[haydn callow]

Got some steel tube....18.25 od with a wall of 1.25 ??? it's a old fold up camping chair...

[g8dhe]

How exact must that measurement be? Could you get thicker walled tube reamed out?

Pretty close, OD can't be any bigger than 18mm that is already an interference fit, the 16mm ID could be a little smaller 15.8mm perhaps, but it too ideally needs to be an interference fit around a 16mm dia carbon fibre "rounded" hexagonal tube, there will be a little ability to compress it, but trying to ream out a 5cm length is going to leave it conical on the inside which will defeat the object a bit as it needs to be stable inside the added tube which will be used to support the carbon fibre rod in a vertical position with a load at the top.
Its actually a Monopod to be mounted inside a small table top tripod, so the two dimensions are pretty much fixed

Many thanks in advance!

[g8dhe]

Got some steel tube....18.25 od with a wall of 1.25 ??? it's a old fold up camping chair...

Thanks Haydn I think the OD is going to be a trifle to large, as the 18mm is already an interference fit, infact just measured the original tube and it has a stop at the end which is 18.5mm dia and that doesn't allow any chance of the support getting thru the mounting hole at all.

Many thanks for looking.

[helen&tony]

Hi Geoff
I'll have a rummage later...I disposed of a lot of stuff when we came here, but inherited some ...
Cheers
Helen

[helen&tony]

Hi Geoff
You have mail
Cheers
Helen

[g8dhe]

Thanks Helen, but I think that's going to be a bit on thin side. The problem is I have two pre-set dimensions and it needs to be a good solid mount, experimented with some thin white plastic card last night and it will work fine for a few hours use but I think it might come down to the Ebay stainless steel to get the required rigidity. This is what its required for;

[dobby]

At all the classic bike shows I've been to there's usually a metal stockist there. Worth a go if there's something on in your area?

[The Great Pretender]

Geoff stability wise that looks
Or is it supposed to sway with vibration.

[g8dhe]

Yes its not the ideal situation (especially with my weight on floorboards nearby) I would prefer to use my tripod, but in NT properties your not allowed use of a tripod as it would restrict the routes thru rooms.
So its Monopod for stability, on its own I can use exposure times as long as 1/50 or 20ms anything longer than that and movement creeps in (specially when I have to take 10 shots or more for a Spherical), the problem is that with the very subdued lighting in lots of the rooms you have to then bring the ISO up 1600-3200 and of course that then brings noise problems So next best thing is Monopod with feet (I think I can get away with that the arrangement shown allowed me to get exposures as long as 3 seconds (in fact a bracketed sequence of 5 exposures) which with an ISO of 800 should solve most problems.

But enough photo talk, otherwise I'll really be way off topic, I just felt I stood a better chance of someone knowing a source of suitable material in here rather than "wanted"

[Northern Bongolow]

i have something geoff,send me your adrress and i will post some.
its nice chrome stuff.
to the best of my crude measuring skills it looks like it will be ok.